Gian Maria Volonté
Bartolomeo Vanzetti

Riccardo Cucciolla
Nicola Sacco

Cyril Cusack
Frederick Katzmann

Rosanna Fratello
Rosa Sacco

Geoffrey Keen
Judge Webster Thayer

Milo O’Shea
Fred Moore

William Prince
William Thompson

Claude Mann
Eddie

Edward Jewesbury
Alvan T. Fuller

Armenia Balducci
Virginia Vanzetti

Pier Giovanni Anchisi
Defense Committee member

John Harvey
Minister Palmer

Marisa Fabbri
Mary Splaine

Maria Grazia Marescalchi
Brini

Giacomo Piperno
Pelser

Sergio Fantoni
Consul Giuseppe Andrower

Sergio Serafini

Giorgio Dolfin

Armando Tortorici
(uncredited)

Mario Ingrassia
Court Officer (uncredited)

Osvaldo Peccioli
Court Stenographer (uncredited)